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Finding the Fourth Proportional to 968.91, 1,336.33 and 637.68

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Solution

The fourth proportional to 968.91, 1,336.33 and 637.68 is: 879.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.91 : 1,336.33 = 637.68 : x
  2. Step 2: Convert to fraction form
    968.91/1,336.33 = 637.68/x
  3. Step 3: Cross multiply
    968.91x = 1,336.33 × 637.68
  4. Step 4: Simplify right side
    968.91x = 852,150.91
  5. Step 5: Solve for x
    x = 852,150.91/968.91
  6. Step 6: Final answer
    x = 879.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.